When adding a new DNS zona via wizard only one NS record added

I have a DNS template that I use via DNS wizard, the contents of the tempalte

Code:

[ZONE]
origin={DOMAIN}.
ns={NS1}.
ns={NS2}.
mbox={EMAIL}.
refresh=28800
retry=7200
expire=604800
minimum=86400
ttl=86400

[DNS_RECORDS]
A|{DOMAIN}.|{IP}|0|86400
A|www|{IP}|0|86400
A|mail|{IP}|0|86400
A|backup|{IP}|0|86400
A|files|{IP}|0|86400
A|ftp|{IP}|0|86400
A|stats|{IP}|0|86400
A|stream|{IP}|0|86400
A|collab|{IP}|0|86400
A|mailguard|{IP}|0|86400
A|email|{IP}|0|86400
A|webmail|{IP}|0|86400
A|pma|{IP}|0|86400
A|imap|{IP}|0|86400
A|pop3|{IP}|0|86400
A|smtp|{IP}|0|86400
A|cp|{IP}|0|86400
NS|{DOMAIN}.|{NS1}.|0|86400
NS|{DOMAIN}.|{NS2}.|0|86400
MX|{DOMAIN}.|mail.{DOMAIN}.|10|86400
TXT |{DOMAIN}.|v=spf1 a mx ip4:{IP} ~all|0|86400

when I add a dns zone and enter both NS1 and NS2 ony one NS1 is added.

What am missing?